the larger the tire, u lose a little bottom and gain a little top.. also those xcr hook up well, for about a month, then they are shot, they wear out so dam fast, if your gona spend all the money for itp's, may as well go with some GNCC's, they are amazing, try them out, ive nevr had a tire hook up better than them,, the razr 2 is good too , not as good traction but better cornering and lasts a little longer,